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Infineon Technologies CY8C3866AXI-039T
- Part No.:
- CY8C3866AXI-039T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
CY8C3866AXI-039T.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
CY8C3866AXI-039T from Infineon Technologies (formerly Cypress) is a programmable System-on-Chip (PSoC® 3) integrating an 8-bit 8051 CPU, configurable analog/digital peripherals, 64 KB flash, 8 KB RAM, and full CAN 2.0b interface - designed for embedded control in industrial sensors, medical monitors, and low-power HMI systems.
For engineers reviewing the CY8C3866AXI-039T datasheet, CY8C3866AXI-039T pinout, CY8C3866AXI-039T application, or CY8C3866AXI-039T equivalent, key selection criteria include its 67-MHz operation, 1.71–5.5 V supply range, 200-nA hibernate mode, USB 2.0 Full-Speed peripheral support, and CapSense®-enabled touch I/O routing.
Technical Context
The CY8C3866AXI-039T implements a mixed-signal SoC architecture centered on a pipelined 8051 core with DMA and a 24-bit digital filter processor (DFB), enabling real-time signal conditioning without host CPU intervention. Its analog subsystem includes a configurable delta-sigma ADC (8–20 bit), four opamps, and programmable SC/CT blocks for PGA/TIA/mixer functions.
Digital flexibility stems from 24 universal digital blocks (UDBs) that implement user-defined logic, communication protocols (UART/SPI/I²C/LIN/CAN), and timing functions - all routable to any of 62 GPIOs via the Digital System Interconnect (DSI). Clocking supports internal PLL (up to 67 MHz), 32.768-kHz watch crystal, and low-power oscillators at 1/33/100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8-bit 8051 with 32 interrupt inputs and 67-MHz max clock - enables deterministic real-time control in resource-constrained systems. |
| Flash / RAM | 64 KB program flash with ECC-capable 8 KB additional flash; 8 KB SRAM - supports secure firmware updates and data logging buffers. |
| Analog ADC | Configurable 8–20-bit delta-sigma ADC with programmable gain - delivers high-resolution sensor acquisition without external signal conditioning. |
| Digital Peripherals | Full CAN 2.0b (16 Rx/8 Tx buffers), USB 2.0 FS (12 Mbps), I²C (1 Mbps), 4× TCPWM blocks - integrates fieldbus, human interface, and motor control in one chip. |
| Power Modes | 200-nA hibernate with RAM retention, 1-µA sleep, 12 mA active @ 48 MHz - extends battery life in portable medical and IoT edge nodes. |
| I/O System | 62 GPIOs with CapSense® support, 8 SIO pins (25 mA sink, overvoltage tolerant), USBIO pins - enables robust touch interfaces and direct LCD segment drive (46×16). |
Pinout & Package
This device is packaged in a 68-pin QFN (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Cypress document 001-11729 Rev. AH, pages 6–11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDD | Analog/Digital Power Supply | Separate 1.71–5.5 V domains enable noise-isolated analog sensing while maintaining digital logic integrity. |
| P0[0]–P0[7] | General-purpose I/O with CapSense® | Supports self- and mutual-capacitance touch sensing; routed to internal SAR/DS ADC for proximity or slider input. |
| P1[0]–P1[7] | Performance I/O (SIO) | 25 mA sink capability, programmable thresholds, comparator function - drives LEDs, relays, or interfaces with 5 V logic safely. |
| USB_DP / USB_DM | USB 2.0 Full-Speed Interface | Integrated transceiver with internal 1.5 kΩ pull-up; requires no external PHY - reduces BOM for HID or CDC-class devices. |
| CAN_TX / CAN_RX | Controller Area Network Interface | Dedicated differential pair supporting 1 Mbps CAN 2.0b with hardware message filtering and FIFO buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Analog Blocks | Four SC/CT blocks configured as PGA, TIA, mixer, or sample-and-hold - replaces discrete opamp networks for current/voltage sensing. |
| CapSense® Engine | Hardware-accelerated capacitive sensing up to 62 electrodes with built-in IDAC and noise rejection - enables reliable touch buttons/sliders without MCU overhead. |
| Digital Filter Block (DFB) | 24-bit fixed-point 64-tap FIR/IIR filter engine - performs real-time ECG/EEG preprocessing or motor current harmonics analysis autonomously. |
| Flexible Clocking | Internal PLL (3–62 MHz), 32.768-kHz watch crystal input, 12 programmable dividers - synchronizes USB, CAN, and ADC sampling with jitter < ±50 ps. |
| Secure Bootloader | Field-upgradable firmware via UART/I²C/SPI/USB with checksum and flash protection - ensures safe OTA updates in certified medical devices. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/pressure sensor node communicating over CAN bus in factory automation. IC Role / Device Role / Timing Role: Central controller managing analog sensor front-end, CAN protocol stack, and low-power scheduling. Use Value: Integrated CAN + 200-nA hibernate eliminates external transceiver and RTC, reducing standby power to <1 µW. | Use Scenario: Wearable ECG patch acquiring biopotential signals and transmitting via USB HID to clinical tablet. IC Role / Device Role / Timing Role: Signal acquisition SoC with delta-sigma ADC, DFB-based noise filtering, and USB endpoint controller. Use Value: On-chip DFB processes raw ECG in real time, reducing host-side computation and enabling 24-hour continuous monitoring on coin cell. |
| Smart Home Touch Panel | Motor Control Interface |
Use Scenario: Wall-mounted HVAC control panel with capacitive sliders, LED indicators, and local fan speed regulation. IC Role / Device Role / Timing Role: Human-machine interface controller with CapSense®, PWM-driven LED dimming, and I²C-connected display driver. Use Value: Single-chip solution replaces microcontroller + touch IC + LED driver, cutting BOM cost by 35% and PCB area by 40%. | Use Scenario: BLDC motor starter module with hall-effect feedback, current sensing, and commutation logic. IC Role / Device Role / Timing Role: Real-time motor controller using UDB-generated six-step commutation, ADC-sampled phase currents, and PWM outputs. Use Value: Programmable UDBs implement custom commutation timing and fault response (<1 µs latency), eliminating need for external gate driver logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C3866LTI-061 | Same PSoC 3 architecture but in 100-pin TQFP; higher I/O count (72 pins), no USBIO support | Better suited for complex HMI with large LCD; lacks integrated USB physical layer | Select when board layout requires larger pitch or needs >62 GPIOs without USB connectivity |
| STM32F072CBT6 | ARM Cortex-M0 core, 128 KB flash, 16 KB RAM; no configurable analog blocks or CapSense® | Requires external components for touch or precision analog sensing; stronger ecosystem for USB-CDC and BLE bridging | Select when leveraging STM32CubeMX toolchain or needing certified USB audio/HID classes beyond PSoC Creator scope |
Compared with CY8C3866LTI-061 and STM32F072CBT6, the CY8C3866AXI-039T uniquely combines hardware-accelerated CapSense®, analog configurability, and USB 2.0 FS in a compact QFN - making it optimal for space-constrained, mixed-signal edge nodes where analog integration reduces system-level complexity.
Availability
CY8C3866AXI-039T is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart home touch panels, and motor control interfaces requiring stable component supply across extended product lifecycles.
Supply support for CY8C3866AXI-039T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains full product continuity, technical documentation, and long-term supply commitment for the PSoC® portfolio.
The CY8C38 family belongs to Infineon's programmable mixed-signal SoC product line, engineered to replace discrete analog/digital components in cost-sensitive, low-power embedded systems requiring rapid customization without ASIC development.
FAQ
What debug interfaces does CY8C3866AXI-039T support?
It supports JTAG (4-wire), Serial Wire Debug (SWD, 2-wire), and Single Wire Viewer (SWV) for real-time trace and firmware debugging. The MiniProg3 programmer/debugger is officially supported, and PSoC Creator IDE provides full integration including memory inspection, breakpoint setting, and live register monitoring during execution.
Does CY8C3866AXI-039T include a hardware USB transceiver?
Yes - it integrates a full-speed USB 2.0 physical layer compliant with TID#40770053, supporting 12 Mbps data rates without external PHY. Internal oscillator-based USB timing meets USB specification jitter requirements, and USBIO pins are electrically rated for hot-swap and ESD protection per IEC 61000-4-2 Level 4.
Can the delta-sigma ADC operate independently of the CPU?
Yes - the ADC can be triggered by hardware events (e.g., timer overflow, GPIO edge) and store results directly to memory via DMA. Its programmable resolution (8–20 bit), built-in reference (1.024 V ±0.1%), and oversampling engine allow autonomous high-accuracy acquisition - critical for battery-operated sensor loggers running in hibernate mode.
Is CapSense® functionality available on all GPIOs?
Yes - all 62 general-purpose I/Os support CapSense® with dedicated hardware scanning engine, IDAC current sources, and shield/sense routing. This enables simultaneous multi-electrode scanning (up to 62 sensors), automatic baseline tracking, and noise immunity tuning - verified per AN85951 and CapSense® Component datasheet v5.80.
CY8C3866AXI-039T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 100-LQFP
- Series:
- PSOC™ 3 CY8C38xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 67MHz
- Connectivity:
- EBI/EMI, I2C, LINbus, SPI, UART/USART, USB
- Peripherals:
- CapSense, DMA, LCD, POR, PWM, WDT
- Number of I/O:
- 62
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 5.5V
- Data Converters:
- A/D 16x20b; D/A 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3866AXI-039T FAQ
1.How can I place an order for CY8C3866AXI-039T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3866AXI-039T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY8C3866AXI-039T reliable?
The price and inventory of CY8C3866AXI-039T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3866AXI-039T is usually 5 days.
3.What payment methods are accepted for CY8C3866AXI-039T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3866AXI-039T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3866AXI-039T?
CY8C3866AXI-039T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3866AXI-039T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY8C3866AXI-039T?
For technical support, including CY8C3866AXI-039T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3866AXI-039T requirements.
6.How does Aetrix verify that CY8C3866AXI-039T is sourced from the original manufacturer or authorized distributors?
All CY8C3866AXI-039T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY8C3866AXI-039T meets industry standards.
7.What is the process for return or replacement of CY8C3866AXI-039T?
All CY8C3866AXI-039T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3866AXI-039T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY8C3866AXI-039T part is unused and in its original packaging.
Return procedure for CY8C3866AXI-039T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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